Got x2... few ?????

[bluebanshee]

Just got an 89' with:
coffman pipe
aluminum waterbox
skat SS impeller
toploader
rideplate
mikuni carb w/flame arrester
west coast head (do they only come in higher compression?)
aluminum bars
oil block-off

Back cylinder is low (116 psi) and front is 135 psi. I hope to rebuild it this week and have it in the water soon.
Took it out just to see how it ran and it ran like a turd, just like one I rode a few years ago that had a pipe. How should this thing run once I rebuild it? How would it compare to a stock SJ 701?
Cheapest I found a wiseco rebuild kit was $179 w/gaskets + shipping. Was told the motor is stock bore and never rebuilt, from "said" original owner.
If I'm happy with it once its rebuild I'll smooth out the top deck and paint it, and likely do tubbies, if not I'm either selling the ski or parting it out. Just curious how these 650's should run....

 

[ADDict]

I think you definitely need a rebuild, or at least a head gasket! I think any Westcoast head you have should raise the compression from stock, which should be around 150.
With all the mods you have that ski should hit good, and not run like a turd!

 

[X2guy]

Pull the cylinder off first. Have a look to see how worn it is and if possible measure the bore. You can usually find a cheap pair of std. size pistons on ebay.
As Addict said it could also be the head gasket. WC heads use special gaskets as the domes are sealed with orings. Check the orings. The gaskets are hard to find so I have always cleaned the old one up well and sprayed on permatex spray on gasket to reuse it.

 

[bluebanshee]

Damn, I didn't know those heads used special gaskets, I have the stock head for it too that I can always use. Maybe just mill the stocker a bit? Yeah I knew it needed rebuilt when I looked at it because I took my compression tester with me. I will just do .25 or .5mm.... Thanks for the info, I didn't know that.

 

[shawn_NJ]

Even with a pipe and carb, a 650 is not very impressive. I ran almost the exact same setup you have on 2 X-2's for years. It is not even in the same league as my 701 X2 with a bpipe.

 

[bluebanshee]

Where can I get the o-rings for the head? Now I don't know if I even want to rebuild the 650 if its still not going to have much power ( After machine work and pistons, I'd have $250 in it, and if its still not that much faster I'm not sure that I could get much for the motor.

After reading, I may consider rebuilding with cast pistons although I've always used wiseco's in non-watercraft.

 

[bluebanshee]

Anyone know how comparable this ski would be to a stock waveblaster 1?

 

[ADDict]

It won't ever be in the league of a 701.. Not sure about the blasters as I've only ridden a mod blaster, but I'd say it's not close.
The 650 with high compression can be a fun ski, however you would be money ahead to put a 750 in it. For the 250 you'll have into the rebuild, you could be well on your way to a nice 750. A nicely tuned 750 in that X2 is a totally different ride. I had a bolt-on 650 last year and loved it, however I won't own another 650 X2, ever. Like I said, it will be a fun ski to ride, just don't hop on anyones 780 B-pipe'd X2 because you won't want to ride yours anymore!!
It all just depends on what you want to spend on it. If your content with something to ride, just fix it. If your always going to want more power like most of us, you need to go ahead with the 750 in my opinion.

 

[shawn_NJ]

You could look around for another motor. I tried selling a good running 145/145 650 motor for $150 and I couldnt sell it...there not worth much. There was a few 750 motors in the $500 range that are a much better platform to build up. Doesnt seem like a good investment of $250 to sink into a 650 though.

 

[shawn_NJ]

It won't ever be in the league of a 701.. Not sure about the blasters as I've only ridden a mod blaster, but I'd say it's not close.
The 650 with high compression can be a fun ski, however you would be money ahead to put a 750 in it. For the 250 you'll have into the rebuild, you could be well on your way to a nice 750. A nicely tuned 750 in that X2 is a totally different ride. I had a bolt-on 650 last year and loved it, however I won't own another 650 X2, ever. Like I said, it will be a fun ski to ride, just don't hop on anyones 780 B-pipe'd X2 because you won't want to ride yours anymore!!
It all just depends on what you want to spend on it. If your content with something to ride, just fix it. If your always going to want more power like most of us, you need to go ahead with the 750 in my opinion.

GREAT ADVICE!!!

 

[bluebanshee]

Great, but sad. Well I may as well go with some 70 or 80 pistons for cheap and think about either parting it out, selling the ski whole or getting a 750 for it.

 

[bluebanshee]

I would be happy if it ran as good as a modified js550.

 

[shawn_NJ]

I hope you dont.... but if you part out, I'll buy your steering cable....LOL

 

[bluebanshee]

Will the gasket that comes with the kit fit the ocean pro intake/44(rcn?)carb?

 

[WFO Speedracer]

Will the gasket that comes with the kit fit the ocean pro intake/44(rcn?)carb?

No it will come with gaskets for a 28mm or 38mm kehin,the Mikuni did not come stock on the X2,it looks like you cooked a piston on the engine,you might want to replace the crank seals while you are that far along.

 

[bluebanshee]

Do you think the crank seal could have leaned that cylinder out? I only ran it for about 5 minutes, and these are the original pistons.

Just pull the motor and dig the seals out?

 

[bluebanshee]

Another few questions. The westcoast head gasket is seperating, so where can I get one? I have the stock and will use it if i need too. If I can't get a gasket between the carb and intake, could I use something like yamabond or 1211? Thanks!

 

[madscientist]

pull the head gasket strip it down to the metal, then rough it up w/ some 400 grit , clean the surface, apply a liberal coat of copperseal spray to each side and allow to dry.

yes suzuki / kawi/ and yamabond can be ysed but you can buy carb base gaskets from surfjetlouie for a 1$ each if you buy a pack of ten

 

[WFO Speedracer]

I can't tell you what caused that cylinder to lean out but I can tell you that something did,the crank seals are a logical place to start.

 

[bluebanshee]

I forgot to mention the head wasnt as tight as it should have been, it seems that the back cylinder was leaking (likely) into the waterjacket. There was a little bit of vaseline like sludge there. The head gasket is actually seperating, its 2 layers.... or do you mean clean all 4 sides up and put it back together? These pistons have nearly 20 years on them...
I suppose front and rear crank seals are cheaper than another rebuild.
Do the cases have to be split for the rear seal to be replaced?